scholarly journals The relative roles of density and climatic variation on population dynamics and fecundity rates in three contrasting ungulate species

2000 ◽  
Vol 267 (1454) ◽  
pp. 1771-1779 ◽  
Author(s):  
Tim Coulson ◽  
E. J. Milner–Gulland ◽  
Tim Clutton–Brock
Keyword(s):  
Population Dynamics ◽  
Climatic Variation

Population dynamics of Japanese pink salmon (Oncorhynchus gorbuscha): are recent increases explained by hatchery programs or climatic variations?

2006 ◽  
Vol 63 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Kentaro Morita ◽  
Shoko H Morita ◽  
Masa-aki Fukuwaka
Keyword(s):  
Population Dynamics ◽  
Density Dependence ◽  
Climatic Factors ◽  
Pink Salmon ◽  
Climatic Variation ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Climatic Variations ◽  
Mass Release ◽  
Effects Of Density

Hatchery programs involving the mass release of artificially propagated fishes have been implemented worldwide. However, few studies have assessed whether hatchery programs actually increase the net population growth of the target species after accounting for the effects of density dependence and climatic variation. We examined the combined effects of density dependence, climatic variation, and hatchery release on the population dynamics of Japanese pink salmon (Oncorhynchus gorbuscha) from 1969 to 2003. The population trends were more closely linked to climatic factors than to the intensity of the hatchery programs. The estimated contributions of hatchery-released fry to catches during the past decade are small. We concluded that the recent catch increases of Japanese pink salmon could be largely explained by climate change, with increased hatchery releases having little effect.

scholarly journals Population dynamics of Norwegian red deer: density–dependence and climatic variation

1998 ◽  
Vol 265 (1393) ◽  
pp. 341-350 ◽  
Author(s):  
M.C. Forchhammer ◽  
N.C. Stenseth ◽  
E. Post ◽  
R. Landvatn
Keyword(s):  
Population Dynamics ◽  
Density Dependence ◽  
Red Deer ◽  
Climatic Variation ◽  
Deer Density

scholarly journals Species with more volatile population dynamics are differentially impacted by weather

2015 ◽  
Vol 11 (2) ◽  
pp. 20140792 ◽  
Author(s):  
Joshua G. Harrison ◽  
Arthur M. Shapiro ◽  
Anne E. Espeset ◽  
Christopher C. Nice ◽  
Joshua P. Jahner ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Southern Oscillation ◽  
Weather Conditions ◽  
Climatic Variation ◽  
Butterfly Species ◽  
Bayesian Modelling ◽  
Volatile Species ◽  
Modelling Framework ◽  
Stable Species ◽  
Abiotic Interactions

Climatic variation has been invoked as an explanation of population dynamics for a variety of taxa. Much work investigating the link between climatic forcings and population fluctuation uses single-taxon case studies. Here, we conduct comparative analyses of a multi-decadal dataset describing population dynamics of 50 co-occurring butterfly species at 10 sites in Northern California. Specifically, we explore the potential commonality of response to weather among species that encompass a gradient of population dynamics via a hierarchical Bayesian modelling framework. Results of this analysis demonstrate that certain weather conditions impact volatile, or irruptive, species differently as compared with relatively stable species. Notably, precipitation-related variables, including indices of the El Niño Southern Oscillation, have a more pronounced impact on the most volatile species. We hypothesize that these variables influence vegetation resource availability, and thus indirectly influence population dynamics of volatile taxa. As one of the first studies to show a common influence of weather among taxa with similar population dynamics, the results presented here suggest new lines of research in the field of biotic–abiotic interactions.

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